Multi-bending collision-free stirrup and application thereof

Abstract

The application discloses a multiple-bending anti-collision stirrup and application thereof, compared with a traditional 135-degree hook stirrup or a welded closed stirrup, the constraint effect of the stirrup on the concrete inside the stirrup is ensured by changing the bending times and the bending form of the stirrup, the last bending section of the stirrup is deviated to the inside of the enclosed shape of the stirrup, or is parallel to the periphery of the stirrup and is spot-welded at the end to ensure that the stirrup does not collapse when being stressed. The multiple-bending anti-collision stirrup is mainly used in the shear wall edge component or the column of the anti-seismic concrete structure, can avoid the mutual interference and collision of the terminal hook of the traditional 135-degree hook stirrup with the steel bars, the steel bar connecting sleeve or the component internal hole, can avoid the quality problems caused by the welded closed stirrup, ensures the safety of the structure, and meanwhile, the multiple-bending anti-collision stirrup can be automatically produced by using the existing stirrup bending equipment, and the production efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of building engineering, and relates to a reinforced concrete shear wall and column, in particular to a multiple-bending collision-free stirrup and application thereof. BACKGROUND

[0002] Under the action of compression and bending, the compression side of the concrete expands transversely to generate tension in the stirrup, the tension of the stirrup forms a constraint on the concrete, and the ultimate compression strain and compression strength of the compression zone of the concrete are improved by the constraint of the stirrup to ensure the elastic-plastic deformation capacity of the concrete member. In seismic design, the deformation capacity (ductility) of the vertical member is more important than the bearing capacity in most cases, and therefore, the quality and connection strength of the stirrup need to be highly valued.

[0003] In the current reinforced concrete structure, especially the fabricated reinforced concrete structure, a large number of welded closed stirrups are used. With the development of existing new systems and new technologies, the traditional 135° hook stirrup often cannot be realized due to the limitations of processing or construction technology, such as in the position of the prefabricated column or the prefabricated column steel connecting sleeve, the diameter of the steel connecting sleeve is large, the end hook of the traditional 135° hook stirrup collides with the steel connecting sleeve, and the traditional 135° hook stirrup cannot be used. The welded closed stirrup does not need to use a 135-degree hook structure, which has a significant effect on steel avoidance, simplification of processing and construction technology in factories and construction sites, and the current national standards and standard atlas recommend using the welded closed stirrup.

[0004] However, in the current practical engineering application, the welded closed stirrup uses flash butt welding processing, and there are many problems in processing and quality. The welding of the welded closed stirrup is difficult to center, the steel on both sides of the welding point is eccentric, which greatly reduces the butt joint cross-sectional area at the welding point, and the metal at the welding point is not in a uniaxial stress state, which cannot achieve equal strength connection. Even if the welding of the stirrup is centered, the welding quality of the welding point is also prone to instability, and research has found that the current welded closed stirrup, regardless of the type and brand of welding equipment used, can only achieve a qualified rate of about 90%, and even with better equipment and quality control, the qualified rate can only reach about 95%. The quality of the welded closed stirrup cannot be guaranteed, and the stirrup may fracture at the yield strength standard value, which cannot produce a constraint effect, and the elastic-plastic deformation capacity of the concrete member will be significantly weakened, and the expected bearing capacity cannot be achieved. When the welding quality of the welded closed stirrup is 95%, the probability of premature failure of the wall limb can reach 87.15%, and the safety risk is very high. SUMMARY

[0005] In order to solve the problem of steel collision of traditional 135° hook stirrup, avoid the structural safety hidden trouble caused by welding closed stirrup, the purpose of the present application is to provide a multiple bending anti-collision stirrup and its application, by changing the bending times and bending form of the stirrup to ensure the constraint effect of the stirrup on the internal concrete of the stirrup, the last bending section of the stirrup is deviated to the inside of the enclosed shape of the stirrup, or is parallel to the periphery of the stirrup, and the end is spot welded to ensure that the stirrup does not collapse under stress. The multiple bending anti-collision stirrup is mainly used in the shear wall edge component or column of the anti-seismic concrete structure, which can avoid the mutual interference and collision of the end hook of the traditional 135° hook stirrup with the steel, the steel connecting sleeve or the internal hole of the component, and can avoid the quality problem caused by welding closed stirrup, and ensure the safety of the structure. Meanwhile, the multiple bending anti-collision stirrup can be automatically produced by using the existing stirrup bending equipment, and the production efficiency is high.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is:

[0007] A multiple bending anti-collision stirrup, both ends of the stirrup are respectively extended and bent at least once, wherein the first bending section is obtained by the first bending, the bending angle of the first bending section is 90°, and is parallel to one side of the enclosed shape of the stirrup and closely adheres to the upper and lower sides; when the bending is only once, the end of the first bending section is spot welded with the side of the stirrup parallel to it; when the bending times are more than once, the last bending section is parallel to one side of the enclosed shape of the stirrup or deviated to the inside of the enclosed shape of the stirrup, or is parallel to the periphery of the stirrup and closely adheres to the upper and lower sides, and the end is spot welded, so as to ensure that the stirrup does not collapse under stress, and ensure the constraint effect on the internal concrete.

[0008] The bending times of at least one end of the stirrup is twice, at the end with the bending times of twice, the second bending section is formed by continuing to bend after the first bending section, and the length of the first bending section ensures that the second bending section does not collide with the edge component vertical steel, the steel connecting sleeve, the column vertical steel, the vertical hole or the cavity of the concrete component.

[0009] The specific requirements of the second bending section are adjusted according to the bending angle, when the second bending section is deviated to the inside of the enclosed shape of the stirrup, the length thereof is not less than 6 times the diameter of the stirrup; when the second bending section is parallel to one side of the enclosed shape of the stirrup, the length thereof is not less than 8 times the diameter of the stirrup, and when the length is less than 8 times the diameter of the stirrup, the end of the second bending section 12 should be spot welded with the stirrup 1 to be strengthened

[0010] The length of the first bending section is less than the length of the side parallel to the enclosed shape of the stirrup, and the bending angle of the second bending section is between 30° and 80°; or, the length of the first bending section is equal to the length of the side parallel to the enclosed shape of the stirrup, and the bending angle of the second bending section is greater than 90°.

[0011] When the end of the stirrup is bent only once, the length of the first bent section is not less than 8 times the diameter of the stirrup.

[0012] When the last bent section is parallel to the periphery of the stirrup and tightly adheres to the upper and lower portions, and the end is spot welded, the welding spot is arranged at the end of the last bent section.

[0013] The number of bends of at least one end of the stirrup is three, at the end with three bends, the first bent section extends to the edge member tension bar position of the concrete member along one side of the stirrup, is bent inward by 90° to form a second bent section, the second bent section extends to the other side of the stirrup and is bent inward by 135° to form a third bent section inside the enclosed shape of the stirrup, the length of the third bent section is not less than 6 times the diameter of the stirrup, the second bent section and the third bent section serve as the edge member tension bar, and the stirrup avoids collision with the vertical steel bars of the edge member of the concrete member, the steel connecting sleeve, the column vertical steel bars, the vertical hole or the cavity.

[0014] The multiple-bend anti-collision stirrup can be used in the shear wall or column of the anti-seismic concrete structure to avoid collision of the stirrup with the vertical steel bars of the edge member of the concrete member, the steel connecting sleeve, the column vertical steel bars, the vertical hole or the cavity.

[0015] Specifically, the shear wall or column is a shear wall or column with a steel connecting sleeve, a double-sided composite shear wall, a prefabricated wall or a prefabricated column with a vertical hole.

[0016] When applied to the shear wall, the bent section of the stirrup is arranged inside the edge member of the shear wall, and when applied to the column, the first bent section extends to the inside of the second column vertical steel bar at the corner of the column and is then bent inward to form a second bent section inside the enclosed shape of the stirrup, thereby reducing the density of the bent sections of the stirrup at the corner of the column.

[0017] Compared with the prior art, the beneficial effects of the present application are:

[0018] (1) The lap anchoring form of the stirrup in the present application gives multiple stirrup bending types, which can all guarantee the anchoring and stress performance of the stirrup, effectively constrain the concrete, and guarantee the elastic-plastic deformation capacity of the concrete shear wall and the reinforced concrete column.

[0019] (2) The anchoring form of the stirrup in the present application breaks through the limitation of the traditional 135° bent hook stirrup in processing and construction technology, avoids the problem that the welding quality of the welded closed stirrup is difficult to guarantee, has a simple structure, is easy to process, is reliable in quality, and is convenient for practical engineering application.

[0020] (3) The hoop anchor form in the present application has no limit requirement for the form of the concrete member, the bending form can be adjusted according to the shape of the restrained concrete, and can be applied to various forms of shear walls such as ordinary prefabricated concrete shear walls, double-sided composite shear walls and hollow walls, and can also be applied to various forms of concrete columns such as ordinary reinforced concrete columns, formwork columns and hollow columns, so that the application range is wide and the popularization value is high. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic view of the multiple-bending anti-collision hoop of the present application, wherein two bending sections are arranged at the end of the hoop, and the bending angle of the second bending section is 90°.

[0022] Figure 2 It is a three-dimensional schematic view of the multiple-bending anti-collision hoop of the present application, wherein two bending sections are arranged at the end of the hoop, and the bending angle of the second bending section is 90°. Figure 1 It is a schematic view of the multiple-bending anti-collision hoop shown in the figure applied to a shear wall with a steel bar connecting sleeve.

[0023] Figure 3 It is a three-dimensional schematic view of the multiple-bending anti-collision hoop of the present application, wherein two bending sections are arranged at the end of the hoop, and the bending angle of the second bending section is 90°. Figure 1 It is a comparative example of the hoop shown in the figure, that is, a conventional 135° hook-shaped hoop.

[0024] Figure 4 It is a three-dimensional schematic view of the multiple-bending anti-collision hoop of the present application, wherein two bending sections are arranged at the end of the hoop, and the bending angle of the second bending section is 90°. Figure 3 It is a schematic view of the hoop shown in the figure applied to a shear wall with a steel bar connecting sleeve.

[0025] Figure 5 It is a three-dimensional schematic view of the multiple-bending anti-collision hoop of the present application, wherein two bending sections are arranged at the end of the hoop, and the bending angle of the second bending section is 90°. Figure 1 It is a comparative example of the hoop shown in the figure, that is, a welded closed hoop.

[0026] Figure 6 It is a three-dimensional schematic view of the multiple-bending anti-collision hoop of the present application, wherein two bending sections are arranged at the end of the hoop, and the bending angle of the second bending section is 90°. Figure 5 It is a schematic view of the hoop shown in the figure applied to a shear wall with a steel bar connecting sleeve.

[0027] Figure 7 It is a three-dimensional schematic view of the multiple-bending anti-collision hoop of the present application, wherein two bending sections are arranged at the end of the hoop, and the bending angle of the second bending section is 90°. Figure 1 It is a three-dimensional schematic view of the multiple-bending anti-collision hoop of the present application, wherein two bending sections are arranged at the end of the hoop, and the bending angle of the second bending section is 90°.

[0028] Figure 8 It is a three-dimensional schematic view of the multiple-bending anti-collision hoop of the present application, wherein two bending sections are arranged at the end of the hoop, and the bending angle of the second bending section is 90°. Figure 7 It is a schematic view of the multiple-bending anti-collision hoop shown in the figure applied to a shear wall with a steel bar connecting sleeve.

[0029] Figure 9 It is a three-dimensional schematic view of the multiple-bending anti-collision hoop of the present application, wherein two bending sections are arranged at the end of the hoop, and the bending angle of the second bending section is 90°. Figure 1 It is a three-dimensional schematic view of the multiple-bending anti-collision hoop of the present application, wherein two bending sections are arranged at the end of the hoop, and the bending angle of the second bending section is 90°.

[0030] Figure 10 It is a three-dimensional schematic view of the multiple-bending anti-collision hoop of the present application, wherein two bending sections are arranged at the end of the hoop, and the bending angle of the second bending section is 90°. Figure 9 It is a schematic view of the multiple-bending anti-collision hoop shown in the figure applied to a shear wall with a steel bar connecting sleeve.

[0031] Figure 11 It is a three-dimensional schematic view of the multiple-bending anti-collision hoop of the present application, wherein two bending sections are arranged at the end of the hoop, and the bending angle of the second bending section is 90°.Figure 1 The third improved version of the stirrup with multiple bends to avoid collision is shown, wherein the first bend extends to the opposite side of the stirrup and the second bend has a bending angle greater than 90°.

[0032] Figure 12 for Figure 10 The diagram shows a multiple-bending, collision-free stirrup applied to a shear wall with a reinforced sleeve.

[0033] Figure 13 for Figure 1 The fourth improved version of the stirrup with multiple bends to avoid collision is shown, in which only the first bend segment is set.

[0034] Figure 14 for Figure 13 The diagram shows a multiple-bending, collision-free stirrup applied to a shear wall with a reinforced sleeve.

[0035] Figure 15 for Figure 1 The fifth improved version of the stirrup with multiple bends to avoid collision is shown, wherein the end of the stirrup is provided with three bends.

[0036] Figure 16 for Figure 15 The diagram shows a multiple-bending, collision-free stirrup applied to a shear wall with a reinforced sleeve.

[0037] Figure 17 for Figure 9 The diagram shows a multi-bending, collision-free stirrup applied to a double-sided composite shear wall.

[0038] Figure 18 for Figure 11 The diagram shows a multi-bending, collision-free stirrup applied to a double-sided composite shear wall.

[0039] Figure 19 for Figure 13 The diagram shows a multi-bending, collision-free stirrup applied to a double-sided composite shear wall.

[0040] Figure 20 for Figure 9 The diagram shows a multi-bending, collision-free stirrup applied to a shear wall with vertical holes.

[0041] Figure 21 for Figure 11 The diagram shows a multi-bending, collision-free stirrup applied to a shear wall with vertical holes.

[0042] Figure 22 for Figure 13 The diagram shows a multi-bending, collision-free stirrup applied to a shear wall with vertical holes.

[0043] Figure 23 for Figure 1The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column.

[0044] Figure 24 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column. Figure 23 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column.

[0045] Figure 25 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column. Figure 23 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column.

[0046] Figure 26 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column. Figure 13 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column.

[0047] Figure 27 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column. Figure 9 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column.

[0048] Figure 28 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column. Figure 1 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column.

[0049] Figure 29 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column. Figure 13 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column.

[0050] Figure 30 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column. Figure 9 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column.

[0051] Figure 31 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column. Figure 1 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column.

[0052] Figure 32 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column. Figure 13 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column.

[0053] Figure 33 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column. Figure 9 The application shows a schematic diagram of the multiple-bending anti-collision stirrup applied to the reinforced sleeve column.

[0054] In the figure: 1-stirrup; 11-first bending section; 12-second bending section; 13-flash butt weld point; 14-weld point; 15-third bending section; 2-shear wall; 21-vertical hole; 22-cavity; 3-edge component vertical steel bar; 4-edge component tension bar; 5-reinforced sleeve; 6-column; 7-column vertical steel bar. DETAILED DESCRIPTION

[0055] The embodiments of the present application will be described in detail below with reference to the drawings and examples.

[0056] As Figure 1 shown, the present application is a multiple-bending anti-collision stirrup, at the ends of the stirrup 1, by changing the bending number and form of the stirrup 1 end, it ensures that the stirrup 1 does not collapse when stressed, and ensures its constraint effect on the internal concrete, wherein the bending sections are in close contact with each other, and the bending number is counted from the overlapping place of the two ends of the stirrup 1.

[0057] Specifically, the two ends of the stirrup 1 are respectively extended and bent at least once, the first bending gets the first bending section 11, the bending angle of the first bending section 11 is 90°, and it is parallel to one side of the enclosed shape of the stirrup 1 and in close contact with it; when bent only once, the end of the first bending section 11 is spot welded with the side of the stirrup 1 parallel to it; when the bending number is greater than one, the last bending section is parallel to one side of the enclosed shape of the stirrup 1 or deviates to the inside of the enclosed shape of the stirrup 1, or is parallel to the outer periphery of the stirrup 1 and in close contact with it, and the end is spot welded.

[0058] In Figure 1 the embodiment shown, compared with the traditional 135° hook stirrup, the two ends of the stirrup 1 are bent twice respectively, and two bending sections are respectively provided, wherein the first bending section 11 is in front, and the second bending section 12 is at the end. After the first bending section 11, continue to bend 90° to the inside of the enclosed shape of the stirrup 1 to form the second bending section 12, the length a of the second bending section 12 should not be less than 6 times the diameter of the stirrup.

[0059] Figure 2 Provided Figure 1 is a schematic diagram of the application of the multiple-bending anti-collision stirrup to a shear wall with a steel bar connecting sleeve, the steel bar connecting sleeve 5 is arranged at the bottom of the vertical steel bar 3 of the edge component in the shear wall 2, the stirrup 1 is arranged in the edge component area at the end of the shear wall 2, the stirrup-constrained concrete is formed in the edge component area, and the elastic-plastic deformation capacity of the shear wall 2 is ensured. In particular, the length of the first bending section 11 of the stirrup 1 should ensure that the second bending section 12 does not collide with the edge component vertical steel bar 3 and the steel bar connecting sleeve 5 of the shear wall 2. The second bending section 12 is anchored in the inside of the constrained concrete, which can prevent the stirrup 1 from collapsing when the shear wall 2 is subjected to compression-bending stress, and forms an effective constraint effect on the concrete.

[0060] Figure 3 , Figure 4 shown is a traditional 135° hook stirrup and its application in a shear wall with a steel bar connecting sleeve, which is Comparative Example 1 of the present application. The stirrup 1 is only bent once at the end to form the first bending section 11 inside the enclosed shape of the stirrup 1, the bending angle is 135°, and the 135° hooks at the two ends of the stirrup 1 overlap each other. As Figure 4As shown, the diameter of the steel connecting sleeve 5 is obviously larger than the edge component vertical steel bars 3, and when the traditional 135° hooked stirrup is arranged in the range of the steel connecting sleeve 5, the 135° hook at the end of the stirrup 1 collides with the steel connecting sleeve 5, and the stirrup 1 cannot be bound, that is, the traditional 135° hooked stirrup cannot be applied in the range of the steel connecting sleeve 5 of the shear wall 2. Compared with Comparative Example 1, Figure 1 、 Figure 2 As shown, the multiple-bending anti-collision stirrup of the present application can avoid the collision between the stirrup 1 and the edge component vertical steel bars 3 and the steel connecting sleeve 5 of the shear wall 2 through the first bending section 11, and the second bending section 12 is anchored in the confined concrete, which can prevent the stirrup 1 from collapsing when the shear wall 2 is subjected to compression-bending stress, similar to the 135° hook at the end of the traditional 135° stirrup which is anchored in the confined concrete.

[0061] Figure 5 、 Figure 6 As shown, the welded closed stirrup and its application in the shear wall with the steel connecting sleeve are shown in the schematic diagram, that is, Comparative Example 2 of the present application. After the stirrup 1 is bent and formed, it is connected as a whole through flash butt welding between the two ends. As shown, Figure 6 As shown, the welded closed stirrup has no bending section at the end, which can avoid the collision between the stirrup 1 and the edge component vertical steel bars 3 and the steel connecting sleeve 5, facilitate the steel binding work during the construction of the shear wall 2, and be conducive to improving the construction efficiency. However, due to the processing technology, it is difficult to weld and center during the processing of the welded closed stirrup, and the steel on both sides of the flash butt welding point 13 is eccentric, which greatly reduces the butt joint cross-sectional area at the flash butt welding point 13, and the metal at the flash butt welding point 13 is not in a uniaxial stress state, which cannot achieve equal strength connection. Even if the welding and centering meet the requirements, the welding quality of the flash butt welding point 13 is also prone to unstable conditions. The actual engineering investigation found that the welded closed stirrup can only achieve a qualified rate of about 90%. The quality problem of the flash butt welding point 13 will cause the fracture and damage of the flash butt welding point 13 before the steel is subjected to tensile yield, which cannot produce effective constraint effect on the concrete, weakens the elastic-plastic deformation capacity of the shear wall 2, and affects the safety of the building structure. Compared with Comparative Example 2, Figure 1 、 Figure 2 As shown, the multiple-bending anti-collision stirrup of the present application can be once-bent and formed by equipment, has high processing efficiency, does not need welding processing, has no quality hidden dangers, the second bending section 12 is anchored in the confined concrete, which can prevent the stirrup 1 from collapsing when the shear wall 2 is subjected to compression-bending stress, can produce effective constraint effect on the concrete, ensures the elastic-plastic deformation capacity of the shear wall 2, and can avoid the collision with the edge component vertical steel bars 3 and the steel connecting sleeve 5 of the shear wall 2, which achieves Figure 5 、 Figure 6 As shown, the welded closed stirrup can be used in the shear wall 2 with the steel connecting sleeve 5.

[0062] Figure 7 As shown Figure 1 The improvement is that the bending angle of the second bending segment 12 is less than 90° and between 30° and 80°, which makes the processing of the stirrup 1 more convenient, while not affecting the anchoring effect of the second bending segment 12 inside the confined concrete.

[0063] Figure 8 for Figure 7 The diagram shows the application of the improved type 1 in a shear wall with a steel reinforcement connecting sleeve. The second bending section 12 can avoid collision with the vertical steel reinforcement 3 and the steel reinforcement connecting sleeve 5 of the edge members of the shear wall 2.

[0064] Figure 9 , Figure 10 As shown Figure 1 The improved version 2 and its application in a shear wall with reinforced sleeve are illustrated in the diagram. The specific improvement lies in the extension of the first bent section 11 to the other side of the stirrup 1, bending it 90° to form the second bent section 12. The second bent section 12 is flush with one side of the stirrup 1 and does not deviate from the interior of the shape enclosed by the stirrup 1. To prevent the stirrup 1 from splitting under stress, the length 'a' of the second bent section 12 should not be less than 8 times the stirrup diameter. If 'a' is less than 8 times the stirrup diameter, the end of the second bent section 12 should be spot-welded to the stirrup 1 for reinforcement.

[0065] Figure 11 , Figure 12 As shown Figure 1 The improved type III and its application diagram in shear walls with reinforced steel sleeves are shown in the figure. Figure 9 , Figure 10 The specific improvement lies in that the bending angle of the second bending segment 12 is greater than 90° and it is anchored inside the confined concrete. The length a of the second bending segment 12 should not be less than 6 times the diameter of the stirrup.

[0066] Figure 13 , Figure 14 As shown Figure 1 The improved version 4 and its application in shear walls with reinforced sleeves are shown in the following diagram. The specific improvement is that only one bend is set at the end of the stirrup 1 (suitable when it is difficult to set two bends at the end of the stirrup). The first bend 11 is parallel to one side of the stirrup enclosure shape, that is, the bending angle is 90°. The length of the first bend 11 should not be less than 8 times the diameter of the stirrup. The first bend 11 is spot welded to the stirrup 1 for reinforcement. The weld point 14 is set at the end of the first bend 11 to prevent the first bend 11 from breaking off to the outside of the stirrup enclosure shape when the stirrup 1 is under stress.

[0067] Figure 15 , Figure 16 As shown Figure 1The improved version 5 and its application in shear walls with reinforced sleeves are illustrated in the diagram. Specifically, the improvement involves adding a third bend to the two bends at one end of the stirrup 1. The first bend 11 extends to the position of the tie bar 4 at the edge of the shear wall, then bends inward at 90° to form the second bend 12. The second bend 12 extends to the other side of the stirrup 1 and then bends inward at 135° to form the third bend 15. The length of the third bend 15 should not be less than 6 times the stirrup diameter. The second bend 12 and the third bend 15 also serve as the tie bar 4 at the edge of the shear wall. Simultaneously, the stirrup 1 avoids collisions with the vertical reinforcement 3 and the reinforcing sleeve 5 at the edge of the concrete member. The other end of the stirrup 1 has the same structure. Figure 1 .

[0068] Figure 17 , Figure 18 , Figure 19 The figures shown are respectively Figure 9 , Figure 11 , Figure 13 The schematic diagram shows the application of multiple-bend, collision-free stirrups in double-sided composite shear walls. This design ensures that the bent section of stirrup 1 does not extend into cavity 22, thus avoiding interference with the reinforcement construction within cavity 22 and improving construction efficiency.

[0069] Figure 20 , Figure 21 , Figure 22 for Figure 9 , Figure 11 , Figure 13 A schematic diagram of the application of multiple-bending, collision-free stirrups in shear walls with vertical holes shows that the bent section of stirrup 1 does not extend into the vertical hole 21, thus avoiding interference from the bent section of stirrup 1 to the formation of the vertical hole 21 during the processing of shear wall 2.

[0070] Figure 23 As shown Figure 1 A schematic diagram of the application of multiple-bend anti-collision stirrups in columns with rebar connecting sleeves. A rebar connecting sleeve 5 is set at the bottom of the vertical rebar 7 in column 6. The second bend section 12 at both ends of the stirrup 1 can avoid collision with the rebar connecting sleeve 5 at the corner of column 6.

[0071] Figure 24 As shown Figure 23 Improved version one, the improvement lies in that the first bent section 11 of the stirrup 1 extends to the inner side of the second vertical column reinforcement 7 at the column corner, and then bends 90° inward to form the second bent section 12, compared to Figure 23 It can reduce the density of the bent sections of the stirrups at the column corners.

[0072] Figure 25 As shown Figure 23The improvement of the improved type two is that the first bending section 11 of the stirrup 1 extends to the inside of the column corner of the second column vertical steel bar 7, and then bends 135° to the inside of the stirrup surrounding shape to form the second bending section 12, which can reduce the density of the column corner stirrup bending section.

[0073] Figure 26 、 Figure 27 respectively as shown in Figure 13 、 Figure 9 The application diagram of the multiple bending anti-collision stirrup in the reinforced sleeve column in the figure can avoid the collision between the stirrup 1 bending section and the steel bar connecting sleeve 5.

[0074] Figure 28 、 Figure 29 、 Figure 30 respectively as shown in Figure 1 、 Figure 13 、 Figure 9 The application diagram of the multiple bending anti-collision stirrup in the hollow 22 composite column in the figure can realize that the stirrup 1 bending section does not extend into the hollow 22, avoid the interference of the stirrup 1 bending section to the steel bar construction in the hollow 22, and improve the construction efficiency.

[0075] Figure 31 、 Figure 32 、 Figure 33 respectively as shown in Figure 1 、 Figure 13 、 Figure 9 The application diagram of the multiple bending anti-collision stirrup in the vertical hole 21 hollow column in the figure can realize that the stirrup 1 bending section does not extend into the vertical hole 21, and avoid the interference of the stirrup 1 bending section to the vertical hole 21 formed in the process of processing the column 7.

[0076] The shear wall edge component or column of the anti-seismic concrete structure is axially compressed under the action of earthquake, and the shear wall edge component or column generates transverse expansion, which causes tensile stress in the peripheral stirrup, and the end hook of the peripheral stirrup needs to be anchored in the concrete inside the stirrup surrounding shape or adopt a welded closed stirrup to ensure that the stirrup does not fail when the concrete transversely expands, thereby forming a confining pressure constraint effect on the concrete inside the surrounding shape, limiting the transverse expansion of the concrete, improving the ultimate compressive stress and ultimate compressive strain of the concrete, improving the elastic-plastic deformation capacity of the shear wall or column of the anti-seismic concrete structure, and ensuring the safety of the structure. The present application changes the bending times and forms of the stirrup, and the end bending section of the stirrup is parallel or deviated to the inside of the stirrup surrounding shape, ensuring that the anchoring effect of the end bending section of the stirrup inside the confined concrete is not lower than the anchoring effect of the 135° hook of the end of the traditional 135° hook stirrup inside the confined concrete, thereby ensuring that the stirrup can form an effective constraint effect on the internal concrete when the concrete transversely expands, and ensuring the elastic-plastic deformation capacity of the shear wall or column using the multiple-bending collision-free stirrup of the present application. Compared with the traditional 135° hook stirrup, the mutual interference and collision of the end hook of the traditional 135° hook stirrup with the steel bar, the steel bar connecting sleeve or the internal hole of the component can be avoided, and the construction is facilitated. Compared with the welded closed stirrup, the same constraint effect as the welded closed stirrup can be achieved, while the welding quality problem of the welded closed stirrup is avoided, and there is no safety hazard to the structure. At the same time, the multiple-bending collision-free stirrup can be produced automatically and formed once by using existing bending equipment, the production efficiency is higher than that of the welded closed stirrup, and it meets the development goal of building industrialization.

[0077] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes and replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A multi-bend collision-free stirrup, characterized by, The two ends of the stirrup (1) are respectively extended and bent at least once, wherein the first bending section (11) is obtained by the first bending, the bending angle of the first bending section (11) is 90°, and the first bending section (11) is parallel to one side of the enclosed shape of the stirrup (1) and closely adheres to the upper and lower sides; when the bending is only once, the end of the first bending section (11) is spot-welded to the side of the stirrup (1) parallel to it; when the bending is more than once, the last bending section is deviated to the inside of the enclosed shape of the stirrup (1), so as to ensure that the stirrup (1) does not collapse when stressed, to ensure the constraint effect on the internal concrete, and to avoid the mutual interference and collision of the end of the traditional 135° hook stirrup with the steel bars, the steel bar connecting sleeve or the internal hole of the member, wherein when the end of the stirrup (1) is bent only once, the length of the first bending section (11) is not less than 8 times the diameter of the stirrup.

2. The multi-bend collision-free tie according to claim 1, wherein, The number of bendings of at least one end of the stirrup (1) is twice, and after the first bending section (11), the second bending section (12) is formed by further bending at the end with the number of bendings being twice, and the length of the first bending section (11) ensures that the second bending section (12) does not collide with the edge member vertical steel bars (3), the steel bar connecting sleeve (5), the column vertical steel bars (7), the vertical hole (21) or the cavity (22) of the concrete member.

3. The multi-bend collision-free tie according to claim 2, wherein, When the second bending section (12) is deviated to the inside of the enclosed shape of the stirrup (1), the length thereof is not less than 6 times the diameter of the stirrup.

4. The multi-bend collision-free tie according to claim 2, wherein, The length of the first bending section (11) is less than the length of the side of the stirrup (1) parallel to the enclosed shape, and the bending angle of the second bending section (12) is between 30° and 80°; or the length of the first bending section (11) is equal to the length of the side of the stirrup (1) parallel to the enclosed shape, and the bending angle of the second bending section (12) is greater than 90°.

5. The multi-bend collision-free tie according to claim 1, wherein, The number of bendings of at least one end of the stirrup (1) is three, and at the end with the number of bendings being three, the first bending section (11) extends to the position of the edge member tension bar (4) of the concrete member along one side of the stirrup (1), is bent inward by 90° to form the second bending section (12), and after extending to the other side of the stirrup (1), is bent by 135° to the inside of the enclosed shape of the stirrup (1) to form the third bending section (15), the length of the third bending section (15) is not less than 6 times the diameter of the stirrup, the second bending section (12) and the third bending section (15) serve as the edge member tension bar (4) at the same time, and the stirrup (1) avoids collision with the edge member vertical steel bars (3) and the steel bar connecting sleeve (5) of the concrete member.

6. Application of the multiple-bending anti-collision stirrup of claim 1 in the shear wall or column of the anti-seismic concrete structure, to avoid the collision of the stirrup (1) with the edge member vertical steel bars (3), the steel bar connecting sleeve (5), the column vertical steel bars (7), the vertical hole (21) or the cavity (22) of the concrete member.

7. Use according to claim 6, characterized in that, The shear wall or column is the shear wall or column with the steel bar connecting sleeve (5), the double-sided composite shear wall, the prefabricated wall or the prefabricated column with the vertical hole (21).

8. Use according to claim 6, characterized in that, When applied to a shear wall, the bent section of the stirrup (1) is arranged inside the edge component of the shear wall; when applied to a column, the first bent section (11) extends to the inside of the corner of the column behind the second column vertical steel bar (7), and then bends to the inside of the stirrup enclosure shape to form the second bent section (12), reducing the density of the bent section of the stirrup at the corner of the column.

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